/Engine/Source/Runtime/Core/Public/Math/BasicMathExpressionEvaluator.h
Evaluate the given expression, resulting in either a double value, or an error
[TValueOrError](API\Runtime\Core\Math\TValueOrError)< double, [FExpressionError](API\Runtime\Core\Misc\FExpressionError) > Evaluate ( const TCHAR * InExpression, double InExistingValue ) const